Last year after an exhaustive search (see https://www.bbcboards.net/showthread.php?t=1215709) I installed a pair of Impulse 36v40AH, Charge on the Run and 12v25A Victron Charger. At one point I fished at least 20 hours over the course of several trips (with very little running the 4XS) and the batteries had around 40% charge. I fished for 6 hours the other day with very little time on the 4XS and had 94% charge on the batteries. They have been a great upgrade.
Late last Summer I installed FFS and had an issue with voltage shutting down my Garmins during a year end Championship. I decide to purchase an Impulse 12v120AH to replace the X2 AGM. Bill worked with me to replace the AGM Charge on the Run with a Lithium model. I installed everything and went out for the first time for about 8 hours. When I was ready to leave, the battery was dead and I had to troll home. Of course, i immediately thought it was the battery. I spoke with Bill at Impulse multiple times who helped me troubleshoot the issue which ultimately ended up being a shredded belt which prevented the Alternator from working and thus quickly draining the 12v120A. Bill was awesome throughout the entire experience! He was responsive and extremely knowledgeable. Impulse Customer Service before the purchase, during installation (both times) and after purchases has been absolutely First Class. I highly recommend checking out Impulse if you are looking at Lithium now or in the future.
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